“Each passenger’s luggage was found to contain bags of tea leaves. Once we opened those bags we found the individual packages of a brown substance that tested positive for opium,” Piccirilli told ABC7.

The women, who are all from Minnesota, were charged with with manufacturing or delivery of narcotics.

“Today is a great example of how the officers of U.S. Customs and Border Protection work daily to stop the illegal drug flow into the United States,” Matthew Davies, Chicago Area Port Director, said in the statement via CBS Chicago. “Even though these would-be smugglers are trying new concealment methods each and every day, I just want to remind them that if they try to get through Chicago, we will catch them!”